Just returned from a range session with my 505 Gibbs, and I'm a little baffled and wondered if anyone else has experience that could be of help. I loaded 5 of the 525gr TSX with 117gr - 129gr of H4831 powder. Also loaded 5 of the CEB 525gr solids with 117gr - 129gr of H4831 powder. Chrono Data - 525gr TSX H4831: 117gr - 1663fps 120gr - 1772fps 123gr - 1869fps 126gr - 1915fps 129gr - 1933fps Chrono Data - 525gr CEB Solid H4831: 117gr - 1629fps 120gr - 1811fps 123gr - 1836fps 126gr - 1955fps 129gr - 1972fps These readings seem much lower than I expected, and felt recoil seemed remarkably higher than these velocities would suggest. I'm suspicious that I'm not getting correct readings from my chronograph.... BUT, when I clocked some reduced loads, 600gr cast bullet over 50gr of 5744, it was spot on where it should be, 1483fps. Maybe I've got an extra slow batch of H4831, or maybe I should change powders. Helpful insight would be greatly appreciated. Thank you!